Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c55fc83185d080d2d8e2cc71fbd7c02e7a9738a9f5cd323b0017fbf5c717688' 
  AND token = 'F9FePBHHAl5EWcINT3Ikq4CvPp3gYS0AgXNe0aNkq8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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