Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41cb0ab0c046279e5119c8ecfb2b3235254e8abd33741cc3446175b34d1f3bd3' 
  AND token = 'dEo+n1IAlqJ9LZsdSMY8CGr4dUdx8rMNtsqSHbrHPQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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