SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '000a1152351cc5fc4ce5e14e110230e1de6c2488fb25c0e318bb621e6d113299' 
  AND token = 'KYxljt+cXBZjqfUEl2wJ/nT26WeqV6PPYx7krDZg+3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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