Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c258c94c00b73f750988e005be1cf5d7d12e3258728dd03f0b68c10b21888d7' 
  AND token = 'xeyL5gDVzWk+UoZkKsqLhGwEd7Fl0yngF+1yNLEVjBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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