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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '38e0a435907ce31e807d3c8b300f1e7f5a27cb1ef13e45b0b720b97eeb1581ab' 
  AND token = 'F7apUr19XUGruY2fgBjnbmQ1fSD4njZaJzkrNJpPBZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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