Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6acb526c709d4ced6332fc1dd9c5d825ccdc69b8408281d73e3b1fb3e0dc7c4' 
  AND token = 'K2CaBKPij2BX3B51VEZeTUrw8/o3wZWoe/QX8PAB7NM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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