Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c2264f2fbbfd5e35c21482c4a5b1abc4ed5bba36878b7802b9c6a32869d329f' 
  AND token = 'Dp8yQeoPT9yA3e5QJ+3z+Anb0AAjPLyMGoQTfuExgWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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