Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3faece2f3c9b38de9aa7502ba7b86d09d05e98ef929a77b91a7a12a0abe1454' 
  AND token = 'x/jg9BJqEkUbOGac+Kk9LH8ZVTx1TibsuUM6JjhlHrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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