Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffda5fc85b6a8e1180bcde0d8ed5133fd8b5ec7e78e7e8493607c2d8248b95ff' 
  AND token = 'LU3bn25ZGNubXOBXZ3sJhget9x4dch/xAVkO/GsnTs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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