Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cac9065d823816b1c8f2c9691e3ac688f610b5ee03b4d5a98e813ce1ff90678f' 
  AND token = '+hDwtRLZDg4YaDeLx0z/ffTRfux45CplNM3gFWunwVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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