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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '404d91d9ce6a98a418d28317c58eb43619fd91f8e705b5df83bfdf2e6dd76c71' 
  AND token = '2WZeXmafQH7R3pIrfyobIbrCxh0RR3E7GhCH61Qudno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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