Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bde27b046fb1f2fc2c9fbb8d62f9c38b28d769d51df9e3f9ac544b49fdddb799' 
  AND token = 'RMNldjqC5hnrOrGj9qRG3wPTO4mPWjWt6d53p1zIUYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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