Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6ba36bc21b0777384af2747c937ebabb9eb2ad55f6f3ac8365fe4a474caaed2' 
  AND token = 'MQJ+0Lr+sdlL7IvbqUCJI5J3IXWMu4d/YZ1Vg8yrsrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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