Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2ffcc2ce72959f980dadf5c39b6c02275ec37fc626de18c9240e44d19cbd192' 
  AND token = '5X16McGUZEytDZwTRWdZPf1JR3a+A/ShudcU3OLfl+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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