SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ed8bd7d58ed7cde23ac570eaf8152685fdf4798c60065e06c408c84b676e989e' 
  AND token = 'VeWOaXPmx3tGXPkgHbI1b9sKwJ1/E7Kqokpou8Z+m34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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