Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a204018cd60dc662e0c4cc52cd2b5844acdcfd374ec8af53480b8b429e1e54a' 
  AND token = 'VkG9jXMCqLh3trantSuFURCcddo68jUzouAsyZn8EhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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