Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '715cfb4e516a8ed2d40fb76ccdf411bfc7eef4922b7b8371de243c9acc710e22' 
  AND token = 'c1XjTtoQNPZ1vcXXfTPx+RrZU8aA1DGSiJEUEAkF5+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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