Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f17ca02ca2d2c8cb0f398a679b827a96d7995944f4c037570ad1323c79daa1c1' 
  AND token = 'MromM35BeMAdHrzLNQ2NuUh2yhu6phi/YfpkC6/3JIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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