Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b29f4fd75cab37bebdbee0b3c58ac94f53425b6b3d5ee41e51a8efacb23cfc8b' 
  AND token = 'eCA4gJCetgi8eR3g+eNKbdS+xd34oVV6vdlembayoPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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