SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3930f9b16fb5ada158b75f3938830a1c208f2783f81febd2d5c769a0298602e5' 
  AND token = '/hIJzMu+DcxD2UXsO58+KxBFhaNFlnUCLeuuWsAfwoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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