Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d50170ccdb83af2cb6f13b594daa3a5b96773f65b9ab796972ea6893f9ac329' 
  AND token = '/RbkkUA+lcsPU3kpViWmaP8yadEymshi0j++3RhelA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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