Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd7ac1d15c7e614150fbafcde7e8c280794836e158fa26d49a52bb93199afafc4' 
  AND token = 'Bk+6PaeaaiY8y6xGJ1eexQ77WgXwvwu9TfbYd3OCkD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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