SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '085349d8c5b9623ef2afd59adf368b4a0da899d28c7732163dfb2b4289645767' 
  AND token = 'thDSQkMIhBv0RhLsdJL1xO6wX9+As3F6wR6TV9d0XgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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