Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec3db189f73329873917b10e275ecf1edb192666dad690e9e9019dc383044d42' 
  AND token = 'iGLXz3X30bRhWg/jybOZrX5vRnCivpyHtwPvneutzcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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