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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '92e200890ed003665752396809e19a1363704188504e4e17866561965898dff8' 
  AND token = 'aoQv4HUQp1+i08hEFiYk9IAu7xcSru3fUbo//QrhaRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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