Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79beb888f989bb9a87a603efd04c2ab7e1d4891a0430001aaff6b7318cda72d9' 
  AND token = 'VMsSHJN+UeYP2l60PCaomIqpt1IipMJuC3crYsaWmZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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