SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '92137e405991c7fb57f4f5b694a1c383367be24efc95fff80093ae883fd56650' 
  AND token = 'Vs6On3cXJs9sEmYqUqKlUAPITWVWq7a+rsB4MMPXDDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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