Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '683063dc02980f554b41918ec8ca448494e503297a38bf3e73bdc4077be5f405' 
  AND token = 'mMB2KI+aXI1TEc6E46O1eJNeMAXzb60AEqRUrrMQKCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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