Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc6b877ca92be2e8cf091b9998953cea7947063ae62141b8b901e2c15d5ef55a' 
  AND token = 'JDQ1qnBqZpsM75+ven8T7OPdTuFr7ana7JjUflYo6pg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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