Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '936e82d94981be9988d9052ff0643629e693940ab39b5fe2d6acfeac3b06d136' 
  AND token = 'WersKz18CweEf7jVT7Ws5jcaxJYGeiffmxDZ4YmhOqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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