Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '54a14ed3943045195bee2511bb7171c806d0c1364aee951338a21d18e5d7a807' 
  AND token = '8x29bX75+5s/k5QrM4aGBno9JlHavQ/zdgcYDrOMB5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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