Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a77804101c70584033b77f7f05d86e454177051bcb38cb5abc0cf017f7733a5' 
  AND token = '0ISehlJGffTjIWexMPhzVF5koCefxL3vkmdTzj92KkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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