Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9042c7231a0fd34d49fa04e1e18152407d666a824f45ff7da26b392d5f82cbee' 
  AND token = 'UuMJoJ5+JEbUJxoXLDR49xEWI6Y3IYCMsfAcvsB/oN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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