Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '620daa1551325f849a0969ca4ca3bed46bbbefccaf0bb7fcce797e79e6fa6797' 
  AND token = 'g5BA5az5dGY7WYO4qH2xMTmh9shJULZSQc0IacjjO3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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