Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '71a945b377aef5ccd4567c38eb0b49174eb6aadd483fcc5eb1251d108ac78170' 
  AND token = 'AkP5spfUPxL0xyCG5z2xKGjzIaWTo0L5m9BVBE4hU0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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