SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '5d1f7f03f4d767dc9b555a80bf3268a2bb4f095b94c49c4e9e02a061d1286cbe' 
  AND token = 'MMwim4X17giMgydVdls+qKUJDRIOzqeaZaLhT/nncgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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