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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '63138eda0e2de72767abfebace42fba51af21390f1cead6bbba75cd561d0d23d' 
  AND token = '1rthg/TdAApNyd8ppC2ZD8eI7zpMOAkwi7e8JIVMo20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}