Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c45c3df1c33a9bd78169fa32a31c7ceadcc797a90a9b6bbe3f3c3ca22532859b' 
  AND token = 'UnzMkL2N3t+OeZH4nAjED+N95hzdI1xnk83JioKmZCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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