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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd746ba0c0c3ce34e6880a20f1391a0039fb77ede164220efbe9fb94896045ac1' 
  AND token = '+V9Osnagd4rmT6T5NUk0gw1/ZRbYz6lRMyswLOFxPwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}