Sandbox

SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a9538c0915a32426e31807a60500dd8ee4768c62a746d01921008eb57bc14290' 
  AND token = 'f9E755dvUyEI/DUPPbPrKpTm4ubya8TkrtKz553PSus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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