SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c3a86509fd7f6c340f9980e8a12334196b78f51478126475de716b4c422553c6' 
  AND token = '3VDvCWMnkGvcyzsQeFDaaMfuX2xw/FAiv5ZOLyfC97w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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