Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3f680f27412b8d8f5a02f7bd8b6999f4b04b2c17b2d956300a7b8613b319dfc' 
  AND token = 'CrVYz1V5jAD1gPLPpcDQCbqLc29je8OsS0/LQki4uMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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