Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a560f1c08c5a4d9d173671afa5664144299ba3fb1e53d1d70b55507288885f8' 
  AND token = 'x4w91vuoDoGgISmIKYOzDzrDfDMTuoVYNj0mKwMe6Eg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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