SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '79fa3259a4ae3cd2bf312500d4c9299532ec7657716679084f1ca1e9497ce7d6' 
  AND token = 'gnWZICghpAaJJf+hAzszc28RWppf+djq0aCXFD4odqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00145

JSON explain

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