Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e9eeb311368baef2e0401a76975edba0ac77f32d10c109da9c4d33a6301cd3c' 
  AND token = 'dChtIkE9uOhUEpIxWhP0/KdGiYg90KjnymHZWtj0DkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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