Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fb21b1b66e628cb54bd83df58cbc71e034b90c1a54b5e94e407bcabb3a7e20c' 
  AND token = 'OP6csjXQ+HKxCbw8dv0z5TErQKkZqpzI2c3m5Evm6JM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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