Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6e676562a5870c807eb83a6487267c4ad0cb55ee96101a72da8e9629d8a6d8c' 
  AND token = 'fH4Y0+691OOe322EGxvO+6x5gnIzlYUmiDli5s63Aks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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