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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '86b95992863692a1cd9dfefa79df3c5152cf48576fb888689401f28a11f8101f' 
  AND token = '3xw0YNy0FSnc/EEhT/ftEUq3qOEeeRbim7asFLugDDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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