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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '65e696da0ce7ba1e48929dc530e263bbf3e074ea9798a74247b07619409f7366' 
  AND token = 'VimC5A1W0jW64KnMZUQ9g6Is6svMqO7W20oPsYWo90c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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