Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16f62e29430d498c59ef54d1aef114d613689aa1c3d1a4e17bf9f50bf3d78904' 
  AND token = 'Dbv/zVlzCEKQ0vBEcB1HoTcujv4EaVutqfVCtNRWZRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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