SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4ced90b2793269824ded76776c433e486272a5ffbb3fda6642fe4815c1f1c53f' 
  AND token = 'xW+O9zYDT8dxHSrQMtUz9x+VZmS+uePxB+dI9lWUxjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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