Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '286fd63c9f33a6bb738b9bdc503b576484788fff34601133fb304a3731fde7c2' 
  AND token = 'eapakUVPpdvTOhkS+zF0Wv9zUEO3DJ650ymJk15uVmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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