Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb50f02c13d902e31ef04f1dc41f816c6cc11d3747d79599c8fab09010b0df58' 
  AND token = '7Gb2teQPUtZUCnc+lO2HIRZ9BAhHpP+pRkEeEMcvcIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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