Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '549beb1a93807fc4b8784b0307a10699a84c839d51d396639f2c8fcae4e8af5f' 
  AND token = 'U0gCUmgjOawjD5U65hpJfsU/y+cJB/Y8Hj9M988VxQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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