Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8a3306f21236f71944d88b530e3434302975603ebb427be66324f78889a3be6' 
  AND token = 'Btoc9T/CoomHI4H7xe8fheoWfkRV8zlaGtRKUL9pFJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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