Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bebecf644dc7aeb331cab3aee041e5f0527215bc794167c8b4eb4d835cd8b21' 
  AND token = 'eLGDhr3upf9LyCHy+cy4+l4V0uMsDQ3/CDpkpJjWgPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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