Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '07e92600bf8e1bb63556f1ba3c085437a11c30723f9d72e64b7fe870e32c5b2b' 
  AND token = 'eKGWv8888zItzthb434VHJnnipUfKp82AMCM9IHpMSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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