Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5b89d570d7556266ca2870cd0b63de908331cd7a4da603af7c6e4f70ca3e244' 
  AND token = 'DRrifHOl2STqul7RRjHsZ0ZzN8PwLq2fEgYLmqyJnGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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