Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6192ad20ade16a66571b4310ede203e9eeb8692cecfbb8915813bcf39fc5cfb4' 
  AND token = 'lS6RtSLz5QyNxVPv6ICzyzuoBVYSTtcGahQFmqDVPd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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