Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd43f3b610c104e536c34d5387ee5b3bd4dd8f269b4712c7d2195227472b2798' 
  AND token = '8NwqQ44JGq9wcvDAeEgJVdoFMax43uYnMsFj+RM3YFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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