Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3552683be9feeaa18f6792416ddf2fad043c19e713c33f44874308d2661dab3' 
  AND token = 'SI8rr/5HaxD5W+/bkPIqrjIfAvbMEuhN/xkkvHr+Zjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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