SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4e64053706965d24c639db7d7a3c4f68e691040a9b2f77f18bf8aad01161a96a' 
  AND token = 'ExpYNVNZnhXKjE0354arzlirBgttruEKYxBz2XfLFfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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