Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6e7e1c086d29d7721f3be8ce4e9637ef268d38f16ead5eb645194fd34bbefd2' 
  AND token = 'ydzoQmfpjKWukDnnr8P0pxwVfSRgEJspBm6rLq3gbZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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