SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f599c22be25a0fb52abe3f2c7326158831d936817ed5b85dadace05931ab9cf6' 
  AND token = 'OdgYHuwvONribp5sF4wg9qrjj/hsUNliGhIlwvEJlVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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