Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50bfeab7cb332bed9f46f72c3cc5bff4b16526a9c2689334d358e6e4aa2cfe5b' 
  AND token = 'xQOgJdEZdcbCPN+/gbIu/X+aIqt25En7l2to07hJNoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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