Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f4d7460f1c3a3b24e81bea71478b676303b923a34d04d8f681a3af85806ec77' 
  AND token = 'qBYjUo7KYWa7d53sppl88EmRJtnMQQotX1+TiFm/jmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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