Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d998676e6efc48003f69fececa765e6ee48533467181763ce53807869d5eba2' 
  AND token = 'gsrSnXSgjjizoV5ms6HQCqyp0qFPNL7mRVdtTXGjZT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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