Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0d4d8a271b8d45f96bad1793148c93144d049c5ca0d21e33ef5e7afe4e674802' 
  AND token = 'd+c2o24ojya9Vh1KP0/JjhVjvt163ZT2OpP0GtADNpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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